Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe2c2858887fca24e442a27a27ffe86a067533f712fe61203ff4b4aed77bc80' 
  AND token = 'B1xtzYbJNRgr+sxdFWfIjgCPg8dGcqGcB1lgVwgkTr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}